CN210829180U - Temporary abandoned well cap with pressure relief device - Google Patents

Abstract

The utility model discloses a temporary abandoned well cap with a pressure relief device, which comprises an abandoned well cap body, wherein the abandoned well cap body is an inner hollow structure, and is internally provided with a pressure relief hole, a conical sealing surface, a pressure relief cavity and a thread groove II from top to bottom in sequence; a sealing plug is arranged in the pressure relief cavity, and the upper end surface of the sealing plug is attached to the conical sealing surface; a thread plug is arranged in the thread groove II; a return spring is arranged between the sealing plug and the threaded plug; the upper end of the abandoned well cap body is of a boss structure, a plurality of thread grooves I are equidistantly arranged on the periphery of the boss structure, and lifting lugs are arranged in the thread grooves I; a sealing groove I, an external thread and a sealing groove II are sequentially arranged on the outer surface of the lower end of the boss structure of the abandoned well cap body. Compared with the prior art, the beneficial effects of the utility model are that: the operation of installing lifting lugs is convenient; the connecting joint of the abandoned well cap body and the abandoned well cap body adopt an integral design, the structure is simple, and the leakage risk is reduced; meanwhile, the sealing element is compressed to realize sealing, so that the processing difficulty is reduced.

Description

Temporary abandoned well cap with pressure relief device

Technical Field

The utility model relates to a abandon well cap field, specifically be a abandon well cap temporarily with pressure relief device.

Background

In the process of offshore oil drilling, a set of mud line suspension system is required to be installed on the seabed to suspend all layers of casings and tie-back production strings. The mud line suspension system mainly comprises a bearing ring, a casing hanger, an anti-corrosion cap, a conveying tool, a tie-back tool and the like. At present, manufacturers of equipment for a mudline suspension system mainly include FMC, Dril-Quip, Plexus, and Carmylon, etc., and the temporary well abandoning cap of the manufactured mudline suspension system has the following disadvantages, which are shown in FIG. 6.

1. The connecting joint is placed in the inner cavity of the abandoned well cap body, so that the operation space is limited during assembly, and the operation is inconvenient during installation of the lifting lugs.

2. The connecting joint and the abandoned well cap body adopt split design, need to be connected by using threads or bolts, have complex structure and increase leakage risk.

3. The pressure relief device is sealed by adopting metal ball and conical surface matched metal seal, so that the processing precision requirement is extremely high, and the processing difficulty is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a abandon well cap temporarily with pressure relief device, it has characteristics solved and has had that the structure is complicated, the equipment space is limited, the operation is inconvenient, the machining precision requires high, the big problem of the processing degree of difficulty among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme: a temporary abandoned well cap with a pressure relief device comprises an abandoned well cap body, wherein the abandoned well cap body is of an inner hollow structure, and is internally provided with a pressure relief hole, a conical sealing surface, a pressure relief cavity and a thread groove II from top to bottom in sequence; a sealing plug is arranged in the pressure relief cavity, and the upper end face of the sealing plug is attached to the conical sealing face; a thread plug is arranged in the thread groove II; a return spring is arranged between the sealing plug and the threaded plug; the upper end of the abandoned well cap body is of a boss structure, a plurality of thread grooves I are equidistantly arranged on the periphery of the boss structure, and lifting lugs are arranged in the thread grooves I; a sealing groove I, an external thread and a sealing groove II are sequentially arranged on the outer surface of the lower end of the boss structure of the abandoned well cap body.

Preferably, the number of the thread grooves I is 3.

As optimization, a taking and delivering tool is arranged at the upper end of the abandoned well cap body; the taking and delivering tool is of a cylindrical structure, and a groove matched with the lifting lug is formed in the whole body of the taking and delivering tool; the groove is of an inverted J-shaped structure.

Preferably, a thimble is further arranged in the taking and delivering tool.

As optimization, a flow channel hole with a T-shaped structure is arranged in the sealing plug.

Preferably, a sealing groove III is formed in the upper end face of the sealing plug.

Compared with the prior art, the beneficial effects of the utility model are as follows: the original design is that the connecting joint is placed in the inner cavity of the abandoned well cap body, so that the assembly space is limited, and the operation is inconvenient when the lifting lugs are installed; meanwhile, the pressure relief device is sealed by adopting nonmetal, so that the sealing is easy, and the processing difficulty of parts is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the well abandoning cap body of the present invention.

Fig. 3 is a three-dimensional structure view of the well abandoning cap body of the utility model.

Fig. 4 is a schematic structural diagram of the sealing plug of the present invention.

Fig. 5 is a schematic structural view of the groove of the present invention.

Fig. 6 is a schematic structural view of a well abandoning cap in the background art of the present invention.

The abandoned well cap comprises a abandoned well cap body 1, a lifting lug 2, a sealing plug 3, a return spring 4, a threaded plug 5, a connecting thread I6, a sealing groove I7, a connecting thread II 8, a sealing groove II 9, a pressure relief hole 10, a conical sealing surface 11, a pressure relief cavity 12, a connecting thread III 13, a sealing groove III 14, a flow passage hole 15, a taking and delivering tool 16, a groove 17 and an ejector pin 18.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A temporary abandoned well cap with a pressure relief device comprises a abandoned well cap body 1, wherein the abandoned well cap body 1 is of an inner hollow structure, and a pressure relief hole 10, a conical sealing surface 11, a pressure relief cavity 12 and a thread groove II 13 are sequentially arranged in the abandoned well cap body from top to bottom; a sealing plug 3 is arranged in the pressure relief cavity 12, and the upper end face of the sealing plug 3 is attached to the conical sealing surface 11; a thread plug 5 is arranged in the thread groove II 13; a return spring 4 is arranged between the sealing plug 3 and the threaded plug 5; the upper end of the abandoned well cap body 1 is of a boss structure, a plurality of thread grooves I6 are equidistantly arranged on the periphery of the boss structure, 3 thread grooves I6 are arranged, and a lifting lug 2 is arranged in each thread groove I6; a sealing groove I7, an external thread 8 and a sealing groove II 9 are sequentially arranged on the outer surface of the lower end of the boss structure of the abandoned well cap body 1. A connecting thread II 8 of the abandoned well cap body 1 is in threaded connection with the hanger, and sealing rings are arranged in the sealing groove I7 and the sealing groove II 8 and then are matched with the inner surface of the hanger to seal the pressure in the well.

The upper end of the abandoned well cap body 1 is provided with a taking and delivering tool 16; the taking and delivering tool 16 is of a cylindrical structure, and a groove 17 matched with the lifting lug 2 is formed in the whole body of the taking and delivering tool; the groove 17 is in an inverted J-shaped structure. A thimble 18 is also provided in the picking tool 16.

A T-shaped runner hole 15 is arranged in the sealing plug 3. The purpose of pressure relief is achieved through the flow passage hole 15 with the T-shaped structure, medium circulation is guaranteed, and relief pressure is uniform.

And the upper end face of the sealing plug 3 is provided with a sealing groove III 14. To improve the sealing effect when the sealing is needed.

The utility model discloses a theory of operation is:

the outer wall of the abandoned well cap body 1 is provided with three lifting lugs 2 in threaded connection, the taking and delivering tool 16 is cylindrical, and the circumference of the taking and delivering tool is provided with a groove 17 matched with the lifting lugs 2; the groove 17 is in an inverted J-shaped structure. When the taking and delivering tool 16 is sleeved on the abandoned manhole cap body 1, the lifting lugs 2 firstly move along the straight line sections of the grooves 17, and then the taking and delivering tool 16 is rotated, so that the lifting lugs 2 are clamped with the arc line sections of the grooves 17. The groove 17 is a segment of arc, so that the well abandoning cap body 1 can be clamped in the segment of arc under the action of gravity and cannot rotate randomly. When the abandoned well cap is installed, the taking and delivering tool 16 is rotated, the groove 17 drives the three lifting lugs 2 and the abandoned well cap body 1 to rotate, and the connection of the connecting thread II 8 of the abandoned well cap body 1 and the thread of the hanger is realized. The return spring 4 supports the sealing plug 3, and a sealing ring in the top sealing groove 14 is matched with the conical sealing surface 11 of the abandoned well cap body 1 to extrude the sealing ring to form sealing. When it is desired to disconnect the pick tool 16 from the body 1 of the well abandonment cap, the pick tool 16 is rotated in the reverse direction and then lifted up, and the pick tool 16 is retrieved.

When pressure relief is needed, a taking and delivering tool 16 is installed, an ejector pin 18 enters a pressure relief hole 10 of the abandoned well cap body 1, the ejector pin supports the sealing plug 3 to move downwards, the return spring 4 is compressed, the top sealing groove 14 is separated from the conical sealing surface 11 of the abandoned well cap body 1, and an internal sealing medium is discharged through the pressure relief hole 10 through a gap between the sealing plug 3 and the pressure relief cavity 12.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. The utility model provides a abandon well cap temporarily with pressure relief device which characterized in that: the well abandoning cap comprises a well abandoning cap body (1), wherein the well abandoning cap body (1) is of an inner hollow structure, and a pressure relief hole (10), a conical sealing surface (11), a pressure relief cavity (12) and a thread groove II (13) are sequentially arranged in the well abandoning cap body from top to bottom; a sealing plug (3) is arranged in the pressure relief cavity (12), and the upper end face of the sealing plug (3) is attached to the conical sealing surface (11); a thread plug (5) is arranged in the thread groove II (13); a return spring (4) is arranged between the sealing plug (3) and the threaded plug (5); the upper end of the abandoned well cap body (1) is of a boss structure, a plurality of thread grooves I (6) are equidistantly arranged on the periphery of the boss structure, and lifting lugs (2) are arranged in the thread grooves I (6); a sealing groove I (7), an external thread (8) and a sealing groove II (9) are sequentially arranged on the outer surface of the lower end of the boss structure of the abandoned well cap body (1).

2. A temporary abandonment cap with pressure relief device as claimed in claim 1, wherein: thread groove I (6) are equipped with 3.

3. A temporary abandonment cap with pressure relief device as claimed in claim 1, wherein: the upper end of the well abandoning cap body (1) is provided with a taking and delivering tool (16); the taking and delivering tool (16) is of a cylindrical structure, and a groove (17) matched with the lifting lug (2) is formed in the whole body of the taking and delivering tool; the groove (17) is of an inverted J-shaped structure.

4. A temporary abandonment cap with pressure relief device as claimed in claim 3, wherein: an ejector pin (18) is also arranged in the taking and delivering tool (16).

5. A temporary abandonment cap with pressure relief device as claimed in claim 1, wherein: a flow passage hole (15) with a T-shaped structure is arranged in the sealing plug (3).

6. A temporary abandonment cap with pressure relief device as claimed in claim 1, wherein: and a sealing groove III (14) is arranged on the upper end face of the sealing plug (3).

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